Renesas R1EX25064ASA00A#S0

Overview

R1EX25064ASA00A from Renesas Electronics is a 64-kbit serial SPI EEPROM (8,192 × 8-bit) with MONOS memory technology, operating from 1.8 V to 5.5 V supply and supporting up to 3 MHz clock frequency at 1.8 V. It features 32-byte page programming, 5 ms write cycle time, and −40°C to +85°C industrial temperature range - deployed in consumer electronics firmware storage and configuration retention.

For engineers reviewing the R1EX25064ASA00A datasheet, R1EX25064ASA00A pinout, R1EX25064ASA00A application, or R1EX25064ASA00A equivalent, key selection criteria include SPI mode 0/3 compatibility, hardware write protection via W and HOLD pins, 1,000k endurance cycles, 100-year data retention at 25°C, and SOP-8 package footprint constraints.

Technical Context

This device implements a standard SPI slave interface with dual-mode support (CPOL=0, CPHA=0 and CPOL=1, CPHA=1), enabling interoperability with diverse microcontroller host platforms. Its internal architecture includes a 32-byte page buffer, status register with BP0/BP1 block protection bits, and hardware-protected mode activated by SRWD bit + W pin state.

Write operations require explicit WREN instruction followed by WRITE or WRSR commands; the WIP bit in the status register provides polling-based completion detection. All timing parameters - including tWC = 5 ms max write time and tCLQV = 120 ns output valid delay at 1.8 V - are fully specified across the full industrial temperature and voltage range.

Key Specifications

Pinout & Package

Package: 150-mil 8-pin plastic SOP (PRSP0008DF-B / FP-8DBV), lead-free, surface-mount compatible.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar serial EEPROM applications.

Compared with AT25640B-MAHL-T and M95640-DRMN6TP/K, the R1EX25064ASA00A uniquely combines 1.8 V operation, HOLD functionality, and SRWD-enabled hardware write lock - making it optimal for battery-powered or safety-critical systems where robustness against spurious writes outweighs raw speed.

Availability

R1EX25064ASA00A is available at Aetrix Electronics and suitable for consumer audio firmware storage, smart meter configuration retention, and industrial PLC I/O mapping requiring stable component supply across extended production lifecycles.

Supply support for R1EX25064ASA00A includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Renesas Electronics Corporation is a Japanese semiconductor manufacturer specializing in microcontrollers, analog, power, and memory solutions for industrial, automotive, and consumer markets.

The R1EX25xxx series was designed specifically for reliable, low-voltage SPI-based nonvolatile storage in cost-sensitive, space-constrained embedded systems - emphasizing endurance, data retention, and robust write-protection architecture.

FAQ

What is the maximum clock frequency supported by R1EX25064ASA00A at 1.8 V?

The R1EX25064ASA00A supports up to 3 MHz SPI clock frequency when operated at 1.8 V to 5.5 V supply. This is explicitly specified in the AC Characteristics table under "Ta = −40 to +85°C, VCC = 1.8 V to 5.5 V" conditions. At higher voltages (2.5 V to 5.5 V), the max clock increases to 5 MHz, but R1EX25064ASA00A must be used within its rated 3 MHz limit at 1.8 V to ensure timing compliance.

Does R1EX25064ASA00A support hardware write protection independent of software commands?

Yes. The R1EX25064ASA00A implements hardware write protection through the combination of the W (Write Protect) pin and the SRWD (Status Register Write Disable) bit. When SRWD = 1 and W is driven low, the device enters Hardware Protected Mode, locking BP0/BP1 bits and rejecting all WRSR instructions - providing immunity to firmware errors or voltage glitches that could corrupt protection settings.

What package type is used for R1EX25064ASA00A?

R1EX25064ASA00A uses a 150-mil 8-pin plastic SOP package (PRSP0008DF-B / FP-8DBV), lead-free and RoHS compliant. This is confirmed in the Ordering Information table and Pin Arrangement diagram. It is distinct from the TSSOP-8 variant (R1EX25064ATA00A) and shares footprint compatibility with industry-standard SOIC-8 footprints.

How many write/erase cycles can R1EX25064ASA00A endure at 85°C?

At 85°C, the R1EX25064ASA00A guarantees a minimum of 100,000 write/erase cycles, as specified in the Memory Cell Characteristics table. This is derated from the 1,000,000-cycle rating at 25°C to account for accelerated oxide stress at elevated temperature - a critical specification for applications deployed in hot environments like enclosed industrial enclosures or automotive under-hood locations.

Can R1EX25064ASA00A be used in automotive applications?

Renesas documentation states that R1EX25xxx series EEPROMs are authorized for consumer applications (e.g., cellular phones, camcorders, audio equipment) and advises contacting Renesas sales before use in industrial applications such as automotive systems. While the R1EX25064ASA00A meets −40°C to +85°C temperature range, it is classified as "Standard" grade per Renesas quality grading - not certified for automotive AEC-Q100 or functional safety standards. Use in automotive requires formal qualification and approval.